Zero Width Joiner
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ZWJ
Technical/UnicodeKý tự Unicode vô hình (U+200D) dùng để ghép nhiều emoji thành một emoji tổng hợp, chẳng hạn kết hợp người và vật thể thành emoji nghề nghiệp.
The Zero Width Joiner is a non-printing character that, when placed between two emoji, signals that they should be rendered as a single glyph if the platform supports that combination. If not supported, the individual emoji are shown side by side — a graceful fallback.ZWJ sequences enable hundreds of emoji without requiring new code points for each. For example: 👩 + ZWJ + 💻 = 👩💻 (woman technologist). The family emoji, profession emoji, and many diversity emoji all use ZWJ.
Platforms decide which ZWJ sequences to support. Apple, Google, and others may recognize different combinations, which is why some emoji appear differently or as multiple characters across devices.